• A combination reaction is a reaction in which two or more substances combine to form a single new substance.
  • Combination reactions can also be called synthesis reactions.
  • One sort of combination reaction that occurs frequently is the reaction of an element with oxygen to form an oxide.
  • A wheel rim is not very useful by itself.
  • When the rim is combined with a tire, the product can be put on a car and used for a safe and comfortable ride.
  • The two separate items have combined to make something that improves the car ride.
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